Just when you thought insects couldn't get any creepier, the US Air Force has unveiled tiny finger-sized insect spy drones that would be undetectable to most. The example above can be used to inject toxins into enemies during wars. Continue reading for two videos and more information.

Researchers have now developed bio-inspired drones with bug eyes, bat ears, bird wings, and even honeybee-like hairs to sense biological, chemical and nuclear weapons. And the U.S. isn't the only country to have poured money into spy drone miniaturisation. France has developed flapping wing bio-inspired microdrones.

Researchers have now developed bio-inspired drones with bug eyes, bat ears, bird wings, and even honeybee-like hairs to sense biological, chemical and nuclear weapons. And the U.S. isn't the only country to have poured money into spy drone miniaturisation. France has developed flapping wing bio-inspired microdrones. The Netherlands BioMAV (Biologically Inspired A.I. for Micro Aerial Vehicles) developed a Parrot AR Drone last year - which is now available in the U.S. as a 'flying video game'.